MSV11-D/E MOS memory - Revision history

Jnc: /* External links */ Bitsavers has reorganized a bit

2026-10-07T22:08:19Z

External links: Bitsavers has reorganized a bit

← Older revision		Revision as of 22:08, 7 October 2026
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	==External links==		==External links==

	* [http://www.bitsavers.org/pdf/dec/qbus/~~Digital_Microcomputer_Processor_Handbook_1979_80~~.pdf microcomputer processor handbook] - the MSV11-D/E is covered in Chapter 12, pp. 474-493 (pp. 484-503 of the PDF)		* [http://www.bitsavers.org/pdf/dec/qbus/EB-15836-18_Digital_Microcomputer_Processor_Handbook_1979_80.pdf microcomputer processor handbook] - the MSV11-D/E is covered in Chapter 12, pp. 474-493 (pp. 484-503 of the PDF
	* [http://www.bitsavers.org/pdf/dec/qbus/~~Digital_Microcomputer_Products_Handbook_1985~~.pdf Microcomputer Products Handbook] - the MSV11-D/E is covered in Chapter 12 (pp. 185-192 of the PDF)		* [http://www.bitsavers.org/pdf/dec/qbus/EB-26078-41_Digital_Microcomputer_Products_Handbook_1985.pdf Microcomputer Products Handbook] - the MSV11-D/E is covered in Chapter 12 (pp. 185-192 of the PDF)
	* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV1D-OP-001%20MSV11-D,-E%20User's%20Manual.pdf MSV11-D,-E user's manual] (EK-MSV1D-OP-001)		* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV1D-OP-001%20MSV11-D,-E%20User's%20Manual.pdf MSV11-D,-E user's manual] (EK-MSV1D-OP-001)
	* [http://www.bitsavers.org/pdf/dec/qbus/MP00566_MSV11-D_Feb78.pdf MSV11-D Field Maintenance Print Set] (MP00566)		* [http://www.bitsavers.org/pdf/dec/qbus/MSV11-D/MP00566_MSV11-D_Feb78.pdf MSV11-D Field Maintenance Print Set] (MP00566)
	* [http://www.avitech.com.au/mm-files/scans/msv11-m8044-configuration-guide.pdf MSV11-DA,-DB,-DC,-DD Configuration Guide]		* [http://www.avitech.com.au/mm-files/scans/msv11-m8044-configuration-guide.pdf MSV11-DA,-DB,-DC,-DD Configuration Guide]

	[[Category: QBUS Memories]]		[[Category: QBUS Memories]]

Jnc: /* External links */ +microcomputer processor handbook

2023-07-13T18:44:09Z

External links: +microcomputer processor handbook

← Older revision		Revision as of 18:44, 13 July 2023
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	Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.		Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.

	==Further reading==		<!-- ==Further reading== -->

	* ''Microcomputer Products Handbook'', 1985 (pg. 12-~~1 to 12~~-8)

	==External links==		==External links==

			* [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Processor_Handbook_1979_80.pdf microcomputer processor handbook] - the MSV11-D/E is covered in Chapter 12, pp. 474-493 (pp. 484-503 of the PDF)
			* [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Products_Handbook_1985.pdf Microcomputer Products Handbook] - the MSV11-D/E is covered in Chapter 12 (pp. 185-192 of the PDF)
	* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV1D-OP-001%20MSV11-D,-E%20User's%20Manual.pdf MSV11-D,-E user's manual] (EK-MSV1D-OP-001)		* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV1D-OP-001%20MSV11-D,-E%20User's%20Manual.pdf MSV11-D,-E user's manual] (EK-MSV1D-OP-001)
	* [http://www.bitsavers.org/pdf/dec/qbus/MP00566_MSV11-D_Feb78.pdf MSV11-D Field Maintenance Print Set] (MP00566)		* [http://www.bitsavers.org/pdf/dec/qbus/MP00566_MSV11-D_Feb78.pdf MSV11-D Field Maintenance Print Set] (MP00566)

Jnc: Avoid dab

2022-09-22T12:06:45Z

Avoid dab

← Older revision		Revision as of 12:06, 22 September 2022
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	Note that, in common with many [[DEC]] boards, the ''model'' variant is '''not''' the same as the board variant; there is a 'shift' operation when going from one to the other. All MSV11-D cards are 'M8044-xy', where 'x' is not (necessarily) 'D'; all MSV11-E cards are 'M8045-xy', where 'x' is not (necessarily) 'E'. So the MSV11-'''D'''C is tagged 'M8044-'''C'''x' (where 'x' varies, depending on the source of the DRAM chips used).		Note that, in common with many [[DEC]] boards, the ''model'' variant is '''not''' the same as the board variant; there is a 'shift' operation when going from one to the other. All MSV11-D cards are 'M8044-xy', where 'x' is not (necessarily) 'D'; all MSV11-E cards are 'M8045-xy', where 'x' is not (necessarily) 'E'. So the MSV11-'''D'''C is tagged 'M8044-'''C'''x' (where 'x' varies, depending on the source of the DRAM chips used).

	All are [[QBUS#Variable address size\|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[refresh]].		All are [[QBUS#Variable address size\|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[memory refresh]].

	==Errors==		==Errors==

	Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.		Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they are missing, in the image above, of an M8044), and whether it is half or fully populated.

	Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.		Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.

Jnc: /* External links */ +manual, FMPS

2022-06-03T01:05:52Z

External links: +manual, FMPS

← Older revision		Revision as of 01:05, 3 June 2022
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	==Further reading==		==Further reading==

	* ''MSV11-D, E User's Manual'' (EK-MSV1D-OP-001)
	* ''Microcomputer Products Handbook'', 1985 (pg. 12-1 to 12-8)		* ''Microcomputer Products Handbook'', 1985 (pg. 12-1 to 12-8)

			==External links==

			* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV1D-OP-001%20MSV11-D,-E%20User's%20Manual.pdf MSV11-D,-E user's manual] (EK-MSV1D-OP-001)
			* [http://www.bitsavers.org/pdf/dec/qbus/MP00566_MSV11-D_Feb78.pdf MSV11-D Field Maintenance Print Set] (MP00566)
			* [http://www.avitech.com.au/mm-files/scans/msv11-m8044-configuration-guide.pdf MSV11-DA,-DB,-DC,-DD Configuration Guide]

	[[Category: QBUS Memories]]		[[Category: QBUS Memories]]

Jnc: +Further reading

2021-02-08T16:25:30Z

+Further reading

← Older revision		Revision as of 16:25, 8 February 2021
Line 20:		Line 20:
	Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.		Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.

	Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist.		Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.

			==Further reading==

			* ''MSV11-D, E User's Manual'' (EK-MSV1D-OP-001)
			* ''Microcomputer Products Handbook'', 1985 (pg. 12-1 to 12-8)

	[[Category: QBUS Memories]]		[[Category: QBUS Memories]]

Jnc: Explain confusing names

2021-02-08T03:39:45Z

Explain confusing names

← Older revision		Revision as of 03:39, 8 February 2021
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	* MSV11-DC, -EC - 32KB (16K DRAMs)		* MSV11-DC, -EC - 32KB (16K DRAMs)
	* MSV11-DD, -ED - 64KB (16K DRAMs)		* MSV11-DD, -ED - 64KB (16K DRAMs)

			Note that, in common with many [[DEC]] boards, the ''model'' variant is '''not''' the same as the board variant; there is a 'shift' operation when going from one to the other. All MSV11-D cards are 'M8044-xy', where 'x' is not (necessarily) 'D'; all MSV11-E cards are 'M8045-xy', where 'x' is not (necessarily) 'E'. So the MSV11-'''D'''C is tagged 'M8044-'''C'''x' (where 'x' varies, depending on the source of the DRAM chips used).

	All are [[QBUS#Variable address size\|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[refresh]].		All are [[QBUS#Variable address size\|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[refresh]].
Line 18:		Line 20:
	Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.		Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.

	A card tagged "M8044-EH" has been seen; this is probably the result of a production error~~. The MSV11-DC is tagged 'M8044-Cx' (where 'x' varies, depending on the source of the DRAM chips used), and the MSV11-DD is tagged 'M8044-Dx' (likewise)~~. An "M8044-EH" ~~thus~~ implies it is an MSV11-DE - which does not exist.		Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist.

	[[Category: QBUS Memories]]		[[Category: QBUS Memories]]

Jnc: Jnc moved page MSV11-D MOS memory to MSV11-D/E MOS memory: more accurate title

2021-02-08T03:25:47Z

Jnc moved page MSV11-D MOS memory to MSV11-D/E MOS memory: more accurate title

← Older revision		Revision as of 03:25, 8 February 2021
(No difference)

Jnc: typo

2020-05-05T18:09:19Z

typo

← Older revision		Revision as of 18:09, 5 May 2020
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	The '''MSV11-D''' (M8044) was a [[DEC card form factor\|dual]]-height [[QBUS]] [[Dynamic RAM\|DRAM]] [[main memory]] card; the '''MSV11-E''' (M8045) is identical (apparently even using the same [[etch]] [[printed circuit board\|PCB]]), but adds byte [[parity]]. They were used in the [[LSI-11]] [[PDP-11]].		The '''MSV11-D''' (M8044) was a [[DEC card form factor\|dual]]-height [[QBUS]] [[Dynamic RAM\|DRAM]] [[main memory]] card; the '''MSV11-E''' (M8045) is identical (apparently even using the same [[etch]] [[printed circuit board\|PCB]]), but adds byte [[parity]]. They were used in the [[LSI-11]] [[PDP-11]].

	They held 64KB when fully populated with 16Kx1 DRAM [[integrated circuit\|chips]]. Initially they used 4Kx1 DRAMs, giving 16KB when fully populated; later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide, optionally with 2 additional bits for [[parity]] (1 per [[byte]]) in the MSV11-E. Half-populating them (i.e. 1 bank only) produced 8KB and ~~322KB~~ sized versions (depending on DRAM type).		They held 64KB when fully populated with 16Kx1 DRAM [[integrated circuit\|chips]]. Initially they used 4Kx1 DRAMs, giving 16KB when fully populated; later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide, optionally with 2 additional bits for [[parity]] (1 per [[byte]]) in the MSV11-E. Half-populating them (i.e. 1 bank only) produced 8KB and 32KB sized versions (depending on DRAM type).

	Four versions of the parity/non-parity types exist:		Four versions of the parity/non-parity types exist:

Jnc: Another potential error

2020-05-05T15:40:27Z

Another potential error

← Older revision		Revision as of 15:40, 5 May 2020
Line 12:		Line 12:
	* MSV11-DD, -ED - 64KB (16K DRAMs)		* MSV11-DD, -ED - 64KB (16K DRAMs)

	All are [[QBUS#Variable address size\|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory).		All are [[QBUS#Variable address size\|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[refresh]].

	~~They had internal [[refresh]]~~.		==Errors==

			Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.

	A card tagged "M8044-EH" has been seen; this is probably the result of a production error. The MSV11-DC is tagged 'M8044-Cx' (where 'x' varies, depending on the source of the DRAM chips used), and the MSV11-DD is tagged 'M8044-Dx' (likewise). An "M8044-EH" thus implies it is an MSV11-DE - which does not exist.		A card tagged "M8044-EH" has been seen; this is probably the result of a production error. The MSV11-DC is tagged 'M8044-Cx' (where 'x' varies, depending on the source of the DRAM chips used), and the MSV11-DD is tagged 'M8044-Dx' (likewise). An "M8044-EH" thus implies it is an MSV11-DE - which does not exist.

	[[Category: QBUS Memories]]		[[Category: QBUS Memories]]

Jnc: clarify size variants

2020-05-03T18:46:39Z

clarify size variants

← Older revision		Revision as of 18:46, 3 May 2020
Line 3:		Line 3:
	The '''MSV11-D''' (M8044) was a [[DEC card form factor\|dual]]-height [[QBUS]] [[Dynamic RAM\|DRAM]] [[main memory]] card; the '''MSV11-E''' (M8045) is identical (apparently even using the same [[etch]] [[printed circuit board\|PCB]]), but adds byte [[parity]]. They were used in the [[LSI-11]] [[PDP-11]].		The '''MSV11-D''' (M8044) was a [[DEC card form factor\|dual]]-height [[QBUS]] [[Dynamic RAM\|DRAM]] [[main memory]] card; the '''MSV11-E''' (M8045) is identical (apparently even using the same [[etch]] [[printed circuit board\|PCB]]), but adds byte [[parity]]. They were used in the [[LSI-11]] [[PDP-11]].

	They held 64KB when fully populated~~, and were also available in 1/8, 1/4, and 1/2 sized versions. Initially they used 4Kx1~~ DRAM [[integrated circuit\|chips]], later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide, optionally with 2 additional bits for [[parity]] (1 per [[byte]]) in the MSV11-E.		They held 64KB when fully populated with 16Kx1 DRAM [[integrated circuit\|chips]]. Initially they used 4Kx1 DRAMs, giving 16KB when fully populated; later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide, optionally with 2 additional bits for [[parity]] (1 per [[byte]]) in the MSV11-E. Half-populating them (i.e. 1 bank only) produced 8KB and 322KB sized versions (depending on DRAM type).

	Four versions of ~~each~~ exist:		Four versions of the parity/non-parity types exist:

	* MSV11-DA, -EA - 8KB (4K DRAMs)		* MSV11-DA, -EA - 8KB (4K DRAMs)
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	They had internal [[refresh]].		They had internal [[refresh]].

	A card tagged "M8044-EH" has been seen; this is probably the result of a production error. The MSV11-DC is tagged 'M8044-Cx' (where 'x' varies, depending on the source of the DRAM chips used), and the MSV11-DC is tagged 'M8044-Dx' (likewise). An "M8044-EH" thus implies it is an MSV11-DE - which does not exist.		A card tagged "M8044-EH" has been seen; this is probably the result of a production error. The MSV11-DC is tagged 'M8044-Cx' (where 'x' varies, depending on the source of the DRAM chips used), and the MSV11-DD is tagged 'M8044-Dx' (likewise). An "M8044-EH" thus implies it is an MSV11-DE - which does not exist.

	[[Category: QBUS Memories]]		[[Category: QBUS Memories]]